Flame-resistant paper for radio wave absorber member and production method for same

Abstract

An object of the present invention is to provide, in particular, flame-resistant paper for a radio wave absorber member, the flame-resistant paper being unlikely to break during the production process and having favorable producibility in addition to being suitable for a radio wave absorber member and having high flame resistance. The flame-resistant paper for a radio wave absorber member according to the present invention contains pulp, aluminum hydroxide, guanidine phosphate, a binder, and a conductive substance, in which the content of the pulp is 5 to 20 mass %, the content of the aluminum hydroxide is 40 to 70 mass %, the content of the guanidine phosphate is 10 to 20 mass %, the content of the binder is 5 to 10 mass %, and the content of the conductive substance is 0.1 to 12 mass %.

The invention claimed is: 
     
       1. A flame-resistant paper for a radio wave absorber member, comprising:
 pulp in an amount of 5 to 20 mass %, 
 aluminum hydroxide is in an amount of 40 to 70 mass %, 
 guanidine phosphate is in an amount of 10 to 20 mass %, 
 binder in an amount of 5 to 10 mass %, and 
 conductive substance is in an amount of 0.1 to 12 mass %, 
 wherein a mass ratio of the aluminum hydroxide to the binder (content of aluminum hydroxide/content of binder) is 83/17 to 91/9, and 
 wherein a mass ratio of the aluminum hydroxide and the guanidine phosphate to the pulp and the binder (content of aluminum hydroxide+content of guanidine phosphate)/(content of pulp+content of binder) is 67/33 to 80/20, 
 with a result that tensile strength and toughness of the flame-resistant paper is improved. 
 
     
     
       2. The flame-resistant paper for a radio wave absorber member according to  claim 1 , wherein the conductive substance is conductive fiber. 
     
     
       3. The flame-resistant paper for a radio wave absorber member according to  claim 2 , wherein the conductive fiber is present in an amount of 0.5 to 2 mass %, and a relative permittivity is 10 to 250. 
     
     
       4. The flame-resistant paper for a radio wave absorber member according to  claim 2 , wherein the conductive fiber is present in an amount of 5 to 12 mass %, and a transmission attenuation factor is 20 dB or more. 
     
     
       5. The flame-resistant paper for a radio wave absorber member according to  claim 1 , having a basis weight of 80 to 200 g/m 2 . 
     
     
       6. The flame-resistant paper for a radio wave absorber member according to  claim 1 , wherein the binder is at least one selected from the group consisting of a polyvinyl alcohol resin, an acrylic resin, and a styrene-acrylic copolymer resin. 
     
     
       7. A production method for the flame-resistant paper for a radio wave absorber member according to  claim 1 , comprising in this order:
 preparing a slurry including pulp, aluminum hydroxide, a binder, and a conductive substance, 
 performing wet papermaking using the slurry to provide a flame-resistant paper base material for a radio wave absorber member, and 
 impregnating the flame-resistant paper base material for a radio wave absorber member with an aqueous solution containing guanidine phosphate. 
 
     
     
       8. The production method for the flame-resistant paper for a radio wave absorber member according to  claim 7 , further comprising in this order after the impregnating the flame-resistant paper base material for a radio wave absorber member with the aqueous solution containing guanidine phosphate:
 pressurizing the flame-resistant paper base material for a radio wave absorber member; and 
 drying the flame-resistant paper base material for a radio wave absorber member at a temperature of 80 to 170° C.